A rock is found to have 12.75 mg of 238U and 1.19 mg of 206 Pb. Determine the age of therock. The half-life of 238U is 4.51 x 10⁹years.7.5 x 108 years5.8 x 108 years4.7 x 108 years9.7 x 108 years3.9 x 108 years6.6 x 108 years

Age of rockT = (2.303 / ) *log (No/N) Where = 0.693/t1/2Where,No is the initial quantity of 238U…

Answered: A rock is found to have 12.75 mg of…

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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Chapter1: Chemical Foundations

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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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In a nuclear reactor, the excess neutrons produced from fission are absorbed by elements, preferably in solid form, which will not undergo fission when they absorb a neutron. From the table below, choose the best material to absorb neutrons in a nuclear reactor, and then explain your choice. Half-lives of isotopes Isotope Half-Life (if unstable) 1H stable 2H stable 3H 12.3 years 12C stable 13C stable 14C 5730 years 27Al stable 28Al 2.25 minutes 209Bi stable 210Bi 5.01 days
A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of Pb206 in the rock, if it currently contains 1.430 g of U238? The half-life of U238 is 4.47×109 years.
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Ruthenium-106 (106Ru) is used to treat melanoma in the eye. This isotope decays by β– emission with a half-life of 373.59 days. One source of the isotope is reprocessed nuclear reactor fuel. How many protons and neutrons does the 106Ru nucleus contain? Identify the missing daughter nucleus in the β– emission decay of 106Ru below. How many years after 106Ru is implanted in the eye does it take for its decay rate (or activity) to be reduced to 27.5% of the initial decay rate? Use 1 year = 365 days.
Some Radioactive Isotopes Useful in Medical Imaging Mode of Decay Isotope Half-life Use in Medical Imaging B+, y B+, y Carbon-11 Fluorine-18 Phosphorus-32 Chromium-51 Brain scan to trace glucose metabolism Brain scan to trace glucose metabolism Detect eye tumors Diagnose albinism, image the spleen and gastrointestinal tract 20.3 m EF 109 m 14.3 d 27.7 d 44.5 d Cr Fe SiGa E.C., Y В, у E.C., Y E.C., Y Iron-59 Bone marrow function, diagmose anemias 78.3 h 118 d Whole-body : scan for tumors Pancreas scan Lung ventilation scan Scan for bone diseases, including cancer Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle Diagnosis of thyroid malfunction Kidney scan Heart scan and exercise stress test 118 d 13.3 s Strontium-81 22.2 m Technetium-99m 6.01 h 8.04 d Iodine-131 B, y 1Hg 201TI Mercury-197 Thallium-201 E.C., Y 64.1 h E.C., y 3.05 d The radioactive isotope strontium-81 is used in medical imaging as indicated on the table above. If 51.l milligrams of strontium-81 is…
Strontium-89 is a beta emitter with a half-life of 50.6 days that is used in bone cancer treatment. How many days will it take for a 69.6 mg sample of Sr-89 to decay to 0.148 mg? (Assume no excretion of the nuclide from the body).
A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 13.00 µmol of the radionuclide. First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionuclide in each sample to decrease to 1/16 of the initial amount. radionuclide sample initial radioactivity symbol half-life 46 A Sc 84.0 days (choose one) 21 21 time for amount of radionuclide to decrease to 1/16 of initial amount ☐ days 91 B Y 59.0 days (choose one) ☐ days 39 ur 52 C Mn 6.0 days (choose one) ☐ days 25 18 D F 2. hours (choose one) hours 9 1 (highest) half 2 3 4 (lowest) х Ar ?

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A rock is found to have 12.75 mg of 238U and 1.19 mg of 206 Pb. Determine the age of the rock. The half-life of 238U is 4.51 x 10⁹ years. 7.5 x 108 years 5.8 x 108 years 4.7 x 108 years 9.7 x 108 years 3.9 x 108 years 6.6 x 108 years